I've always followed the rule of NEVER using a Beta OS for gigs. Followed it right up until last week when I decided to install it - and it later gave me error screens that I couldn't get rid of until the Kemper support team told me how to reset everything. To me, the acoustic sim is a fun toy - but after having sat with it more, I find that's all it is in terms of live performances. Even with EQ, I couldn't get the full body sound that I was looking for and when someone else plays a real acoustic at the same time, it got buried. So (IMO) it's definitely not worth the risk.
Thanks for the info. Gonna hold off until after my next gig. Don't think we have anything lined up for a while after that.